Server publishing failure

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I use an isa server 2004 as back-end server. isa knows 2 networks : internal and DMZ.
I try to publish an internal telnet server with a listener in DMZ. I created a publish server rule with the wizard and it doesn't work :

The error I get is :

Server publishing rule [HAAS4003 Publishing] that maps 140.123.1.3:23 TCP to 140.123.1.3:23 for protocol [Telnet Server] was unable to bind a socket for the server. The server publishing rule cannot be applied.
The failure is due to error: 0x80070034


I checked isa server and the telnet port is not used.

Any idea ?

Jean-Pascal
.

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